THE NERVOUS SYSTEM. 



121 



FIG. 331. Plan in outline of the encephalon, as seen from the right side, ^. The parts are rep- 

 resented as separated from one another somewhat more than natural, so as to show their connec- 

 tions. A, cerebrum; f, g, h, its anterior, middle, and posterior lobes; e. fissure of Sylvius; B, cere- 

 bellum; C, pons Varolii; D, medulla oblongata; a, peduncles of the cerebrum; 6, c, d, superior mid- 

 dle, and inferior peduncles of the cerebellum. (From Quain.) 



FIG. 332. Lateral view of the brain (semi-diagrammatic). F, Frontal lobe; P, Parietal lobe: O, 

 Occipital lobe; T, Temporo-sphenoidal lobe; S, fissure of Sylvius; S', horizontal, S", ascending ramus 

 of the same; c, sulcus centralis (fissure of Rolando); A, ascending frontal; B, ascending parietal 

 convolution; Fl, superior; F2, middle: F3, inferior frontal convolutions: fl, superior; f 3, inferior 

 frontal sulcus; f3, prse-ceutral sulcus; PI, superior parietal lobule ; P2, inferior parietal lobule con- 

 sisting of P2, supramarginal gyms, and P2', angular gyrus; ip, interparietal sulcus; cm, termination 

 of calloso-marginal fissure; Ol, first, O2, second, O3, third occipital convolutions; po, parieto-oeoipi- 

 tal fissure; o, transverse occipital fissure; o2. sulcus occipitalis inferior: Tl. first. T;!. second, T3, third 

 temporo-sphenoidal convolutions; tl, first, t2, second temporo-sphenoidal fissures. (Ecker.) 



